The bearing is a rotating body that supports the shafting of the ship, by reducing the coefficient of friction during its movement, and ensuring its rotation accuracy. The shafting is an important part of the ship's propulsion system and the core component of the shafting.

The shafting is an important part of the ship's propulsion system, and the bearing is the core component of the shafting. The failure of the stern bearing will affect the operation of the entire ship and also increase the safety hazards of the ship. Therefore, adequate attention should be paid to shafting at all stages of ship design, construction and operation. When the tail shaft is running, the tail shaft and the tail bearing move relative to each other and form a wedge-shaped space. The lubricating oil in the wedge-shaped space is squeezed by a regular force to produce a certain reaction force, and due to the viscosity of the oil itself, it is in the tail. An oil film is formed between the shaft and the stern bearing, which is filled in the narrow wedge-shaped space between the stern shaft and the bearing. The existence of the oil film greatly reduces the contact force between the tail shaft and the tail bearing, thereby reducing the friction and wear between the two surfaces.